Finding the Fourth Proportional to 443.27, 664.59 and 212.00

Step by Step Solution

1. Step 1: Write the proportion equation
   443.27 : 664.59 = 212.00 : x
2. Step 2: Convert to fraction form
   443.27/664.59 = 212.00/x
3. Step 3: Cross multiply
   443.27x = 664.59 × 212.00
4. Step 4: Simplify right side
   443.27x = 140,889.76
5. Step 5: Solve for x
   x = 140,889.76/443.27
6. Step 6: Final answer
   x = 317.85